I pull a 3,000 lb pop-up camper in the rocky mountains during summer a total of around 2,500 miles. At what point should I ask for the differential oil and transfer case oil to be changed and is this something I can do myself with sythetic products? The car is new (5k mi) but the service guide suggests changing these oils at 15,000 miles when using the vehicle "primarily" for trailer towing.
Thanks for any feedback!
Rocky

 

I'd say use your own good judement, if this is something you can do yourself and the cost of oil is $20 then why not do it at the end of each season, or smthg like that.